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| Since backbone cabling supports a wide range of telecommunications services and site sizes, several transmission media types are recognized for use. Requirements Recognized media include: 100 Ω twisted-pair cable (ANSI/TIA/EIA-568-B.2) multimode optical fiber cable, either 62.5/125 µm or 50/125 µm (ANSI/TIA/EIA-568-B.3) singlemode optical fiber cable (ANSI/TIA/EIA-568-B.3) Recognized cables, associated connecting hardware, jumpers, patch cords, equipment cords, and work area cords shall meet all applicable requirements specified in ANSI/TIA/EIA-568-B.2 and ANSI/TIA/EIA-568-B.3. NOTE 1 - Crosstalk between individual, unshielded twisted-pairs may affect the transmission performance of multipair copper cables. Annex B of ANSI/TIA/EIA-568-B.1 provides some shared sheath guidelines for multipair cables. NOTE 2 - There are a number of other application specific backbone cable types that have been used in telecommunications. Although these cables are not part of the requirements of the ANSI/TIA/EIA-568-B.1, ANSI/TIA/EIA-568-B.2 and ANSI/TIA/EIA-568-B.3 standards, they may be used in addition to the minimum requirements described above.
Recognized backbone twisted-pair cables :: | 7/55